... I could then set-up SlaveSites which would share/pull the users from the MasterSite. It is also my understanding that ALL users would be shared - all, or nothing more or less. My questions are; 1- Can I control the SlaveSite user access via the "multiple-profiles" feature in ...

... tables with different prefix). Note that it's not possible to share "some" modules or "some" articles, content can be either shared or unique per site as usual. Running an update of extension or Joomla from main site will affect all sites.

You need to know usual Joomla MVC first. Your sites uses same database tables, so for sure changes will affect all sites. Each site should have separate contents, in this case different layouts will be applied. Otherwise you can't use different layouts, or create a single layout override and display...

Where do i start? I am fairly new with this great software and you did the settings for me(great support) btw. When ever i config the mobile site components it affects the main site as well.

You can create separate layouts per site and configure them in component settings if component has such settings and its config is not shared.

Is it possible to modify a share component files without changing the main site layout?

... steps, the client will be able to control all users within the Main Site. It should work in theory as long as ALL user & usergroups gets shared over all the sites. All sites (Main Site & All Child Sites) MUST use the same user & usergroup database from the Main Site. Usergroups ...

... steps, the client will be able to control all users within the Main Site. It should work in theory as long as ALL user & usergroups gets shared over all the sites. All sites (Main Site & All Child Sites) MUST use the same user & usergroup database from the Main Site. Usergroups ...

Each site has own backend as usual.

Since users can be shared you can manage users from Joomla 3.1 database in Joomla 2.5 site and vice-versa.

Now that I saw in the description of the component that mijoshop can not be shared. I did not understand. can you explain better? have something that does not work?